Car-wheel



(No Model.)

N. WASHBURN.

GAR WHEEL.

N0..356,90'7. Patented Feb. 1, 1887.

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Uni'rn 'rafrns NATHAN IVASHBURN, OF ALLSTON, MASSACHUSETTS.

GAR-WHEEL.

SPECIFICATION forming part oi-Letters Patent No. 356,907, dated February 1, 1887.

(No model.)

To aZZ whom it may concern.-

Bcit known that I, NATHAN Wasnnunn, of Allston, in the county of Sufibllz, of the Commonwealth of Massachusetts, have invented a new and useful Improvement in the Mannfacture of RailwayCar Wheels 5 and I do hereby declare the same to be described in the following specification, and represented in the accompanying drawings, of which Figure l is a transverse and median section, and Fig. 2 a side elevation, of a car wheel ernbodying my invention, the nature of which is defined in the claims hereinafter presented. Fig. 3 is a side View, and 4. is an end view, of its hub-thimble or perforated wrought-iron tube.

This wheel, with the exception of part ofits hub,is made of manganese steel, the remain ing part of the hub consisting not only of an interlining of cast-iron united with the steel in the process of casting, or a thin wrought or cast iron tube having numerous transverse perforations or holes in it,but of a tubular in terlining of cast-iron east within the tube and, wh en su ch tubcis perforated, extending through its holes, and welded or united to both tube and the mass of metal surrounding such tube.

In Figs. 1 and 2 of the drawings the bodyof the wheel of manganese steel is shown at A, the perforated iron tube at B, and the eastiron tubular lining at 0, they being disposed concentrieall y with each other, as represented.

In the process of making this wheel the thin metal1ictubel3,having numerous holesthrough it laterally, is laid in the matrix or mold for casting the wheel so as to be concentric with the circumference of the mold, after which a cylindrical co re of a less diameter than that of the bore of the said tube Bis to be placed concentrically within such tube, both tube and case being firmly fixed in position. Next the manganese steel toconstitute the wheel-body is to be cast into the mold, and at the same time or immediately after a quantity of melted cast-iron suflicieut to fill the space between the core and the perforated tube, and also the perforations of such tube, .is to be run into such space, so as to fill it and the said per-fora 'tions and unite with the metal surrounding the tube.

As soon or soon after the metal may have ter to the manganese-steel wheel the latter becomes greatly toughened or strenghtened.

The manganese steel is a combination of metallic manganese and wrought-iron melted in a crucible with a suitable flux, the product being low in carbon, the manganese generally varying from six to twenty per cent. of the composition. In preparing this steel I usu ally melt the wroughtiron and the manganese in separate crucibles rather than in one, and just before casting the metal, or while it is in the ladle,the melted manganese is to be poured into and thoroughly incorporated with it.

For a method of preparing metallic manganese and what is known in the arts as manganese steel, reference may be had to the British Patent No. 1,660 for 1857.

\Vere that part of the hub of the wheel in which thecye is formed for reception of an axle to be of manganese steel, it, owing to the hardness of such metal, could not easily be bored or reamed to the proper diameter; but by making such part of atubular mass of castiron united, as described, to the mass of manganese steel such eye can easily be enlarged and finished as may be required.

I claim, as an improved manufacture- 1. A car-wheel having its body of manganese steel and part of the hub in which the eye is situated of cast-iron, and between such part and body and concentric, or about so, therewith a perforated iron tube, the mass of cast-iron being united through the perforations of the tube with the mass of manganese steel.

2. A car-wheel having its body of manganese steel and the part of the hub in which the eye is situated of cast-iron, and the whole or the manganese-steel part toughened or strengthened by being immediately, after becoming of sufficient hardness to be removed from the mold in which the Wheel may have been founded, subjected to the action of a bath of cold water, as set forth.

3. A' car-wheel having its body of magenesc steel and part of the hub in which the eye is situated of cast-iron, and between such part and body and concentric, or about so, therewith a perforated iron tube, the mass of cast-iron being united through the perforaro tions of the tube with the mass of manganesse steel and the whole or the manganese-steel part toughened or strengthened by being immedietely, after becoming sufiiciently indurated to be removed from the mold in which the wheel may have been founded, subjected to 15 the action of a bath of cold water, as set forth.

NATHAN WASHBURN. W'itnesses:

R. H. EDDY, R. B. TORREY. 

